# What is the formula for the discriminant of a quadratic equation?

## What is the formula for the discriminant of a quadratic equation?

b²-4ac

The discriminant is the part of the quadratic formula underneath the square root symbol: b²-4ac. The discriminant tells us whether there are two solutions, one solution, or no solutions.

Is there a discriminant for quartics?

The discriminant of the quartic polynomial x4 + cx2 + dx + e. The surface represents points (c, d, e) where the polynomial has a repeated root. The cuspidal edge corresponds to the polynomials with a triple root, and the self-intersection corresponds to the polynomials with two different repeated roots.

### What is the value of the discrimination of the quadratic equation?

The discriminant is the formula b squared minus 4ac remembering that a, b and c are the coefficients of your quadratic in standard form. It tells you the number of solutions to a quadratic equation. If the discriminant is greater than zero, there are two solutions.

How do Discriminants classify the type of solution in a quadratic equation?

The discriminant of the Quadratic Formula is the quantity under the radical, {{b}^{2}}-4ac. It determines the number and the type of solutions of a quadratic equation. If the discriminant is positive, there are 2 real solutions. If it is 0, there is 1 real repeated solution.

## Where is discriminant formula used?

The discriminant formula is used to determine the nature of the roots of a quadratic equation. The discriminant of a quadratic equation ax2 + bx + c = 0 is D = b2 – 4ac. If D > 0, then the equation has two real distinct roots. If D = 0, then the equation has only one real root.

What is the value of discriminant?

For the quadratic equation ax2 + bx + c = 0, the expression b2 – 4ac is called the discriminant. The value of the discriminant shows how many roots f(x) has: – If b2 – 4ac > 0 then the quadratic function has two distinct real roots. – If b2 – 4ac = 0 then the quadratic function has one repeated real root.

### Is there a discriminant for cubics?

Δ = b² – 4ac. If the discriminant Δ is zero, the equation has a double root, i.e. there is a unique x that makes the equation zero, and it counts twice as a root. If the discriminant is not zero, there are two distinct roots.

What if the discriminant is less than zero?

If the discriminant of a quadratic function is less than zero, that function has no real roots, and the parabola it represents does not intersect the x-axis.

## What if the discriminant is greater than zero?

When the discriminant is greater than 0, there are two distinct real roots. When the discriminant is equal to 0, there is exactly one real root. When the discriminant is less than zero, there are no real roots, but there are exactly two distinct imaginary roots.

What if the discriminant is zero?

If the discriminant is equal to zero, this means that the quadratic equation has two real, identical roots. Therefore, there are two real, identical roots to the quadratic equation x2 + 2x + 1. D > 0 means two real, distinct roots. D < 0 means no real roots.

### What is the degree of discriminant?

Discriminant of a Polynomial
The discriminant is a homogeneous polynomial in the coefficients. It is quasi-homogeneous in the coefficients since also a homogeneous polynomial in the roots. The discriminant of a polynomial of degree n is homogeneous of degree 2n − 2 in the coefficients.

How do you solve for discriminant?

## How many roots if discriminant is negative?

0 real roots
If the discriminant is: Positive, you have 2 real roots. Zero, you have 1 real root. Negative, you have 0 real roots(no solution).

How many solutions if the discriminant is negative?

A Negative Discriminant
The square root of a negative number will involve the imaginary number i. This means that if you have a negative discriminant, you will get two complex solutions.

### Why is it called discriminant?

The argument (that is, the contents) of the square root, being the expression b2 − 4ac, is called the “discriminant” because, by using its value, you can “discriminate” between (that is, be able to tell the difference between) the various solution types.

How do I find the discriminant?

## What is an example of the discriminant?

Example: Find the discriminant of the quadratic equation 2×2 – 3x + 8 = 0. Comparing the equation with ax2 + bx + c = 0, we get a = 2, b = -3, and c = 8. So the discriminant is, Δ OR D = b2 − 4ac = (-3)2 – 4(2)(8) = 9 – 64 = -55.

What is discriminant value?

### What if the discriminant is less than 0?

What is a discriminant example?

## What is a discriminant value?

Why is it called the discriminant?

### How do you solve a discriminant?

What does a discriminant of 0 mean?

If the discriminant is 0, that means you have a 0 under the square root in the quadratic formula.